<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item, index) in goods" class="menu-item" :class="{'current': currentIndex === index}"
            @click="selectMenu(index, $event)">
          <span class="text border-1px">
            <span v-if="item.type > 0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item border-1px" @click="selectFood(food, $event)">
              <div class="icon"><img :src="food.icon" width="57" height="57"></div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}</span>
                </div>
                <div class="price">
                  <span class="now"><small>￥</small>{{food.price}}</span><span v-if="food.oldPrice" class="old">￥{{food.oldPrice}}</span>
                </div>
                <div class="contrl-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"
              :selectFoods="selectFoods" ref="shopcart"></shopcart>
    <food :food="selectedFood" ref="food"></food>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import shopcart from '../shopcart/shopcart';
  import cartcontrol from '../cartcontrol/cartcontrol';
  import food from '../food/food';

  import {saveToLocal, loadFromLocal} from '../../common/js/store';

  const ERR_Ok = 0;

  export default{
    props: ['seller'],
    components: {shopcart, cartcontrol, food},
    data() {
      return {
        classMap: ['decrease', 'discount', 'special', 'invoice', 'guarantee'],
        goods: [],
        listHeight: [],
        scrollY: 0,
        selectedFood: {}
      }
    },
    created() {
      var _this = this;
      this.$http.get('/api/goods').then(function (response) {
        response = response.body;
        if (response.errno === ERR_Ok) {
          _this.goods = response.data;
          _this.$nextTick(function () {
            _this._initScroll();
            _this._calculateHeight();
          });
        }
      });

      this.$on('cart.add', function (target) {
        // 体验优化，异步执行下落动画
        _this.$nextTick(function () {
          _this.$refs.shopcart.drop(target);
        });
      });
    },
    updated() {
      // console.log(this.$route.params.id);
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (height2 && this.scrollY >= height1 && this.scrollY < height2) {
            return i;
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach(function (good) {
          good.foods.forEach(function (food) {
            food.count && foods.push(food);
          });
        });
        return foods;
      }
    },
    methods: {
      selectMenu(index, event) {
        if (!event._constructed) return;
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let el = foodList[index];
        this.foodsScroll.scrollToElement(el, 200);
      },
      _initScroll() {
        let _this = this;
        this.menuScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        });
        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
          probeType: 3,
          click: true
        });
        this.foodsScroll.on('scroll', function (pos) {
          _this.scrollY = Math.abs(Math.round(pos.y));
        });
      },
      _calculateHeight() {
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodList.length; i++) {
          let item = foodList[i];
          height += item.clientHeight;
          this.listHeight.push(height);
        }
      },
      selectFood(food, event) {
        if (!event._constructed) return;
        this.selectedFood = food;
        this.$refs.food.show();
        this.$parent.$parent.$emit('pushstate', food.sellCount);
      }
    }
  };
</script>

<style lang="scss">
  @import "../../common/sass/mixin";

  .goods {
    display: flex;
    position: absolute;
    top: 176px;
    bottom: 46px;
    width: 100%;
    overflow: hidden;

    .menu-wrapper {
      flex: 0 0 80px;
      width: 80px;
      background-color: #f3f5f7;
      .menu-item {
        display: table;
        height: 54px;
        width: 56px;
        line-height: 14px;
        padding: 0 12px 0;
        &.current {
          position: relative;
          margin-top: -1px;
          z-index: 10;
          background: #fff;
          font-weight: 700;
          .text {
            @include border-none
          }
        }

        .icon {
          display: inline-block;
          vertical-align: middle;
          width: 12px;
          height: 12px;
          margin-right: 2px;
          -webkit-background-size: 12px 12px;
          background-size: 12px 12px;
          background-repeat: no-repeat;
          &.decrease {
            @include bg-img("decrease_3")
          }
          &.discount {
            @include bg-img("discount_3")
          }
          &.guarantee {
            @include bg-img("guarantee_3")
          }
          &.invoice {
            @include bg-img("invoice_3")
          }
          &.special {
            @include bg-img("special_3")
          }
        }
        .text {
          display: table-cell;
          width: 56px;
          vertical-align: middle;
          font-size: 12px;
          @include border-1px(rgba(7, 17, 27, .1));
        }
      }
    }
    .foods-wrapper {
      flex: 1;
      .title {
        padding-left: 14px;
        height: 26px;
        line-height: 26px;
        border-left: 2px solid #d9dde1;
        font-size: 12px;
        color: rgb(147, 153, 159);
        background: #f3f5f7;
      }
      .food-item {
        display: flex;
        margin: 18px;
        padding-bottom: 18px;
        @include border-1px(rgba(7, 17, 27, .1));
        &:last-child {
          margin-bottom: 0;
          @include border-none;
        }
        .icon {
          flex: 0 0 57px;
          width: 57px;
          margin-right: 10px;
        }
        .content {
          flex: 1;
          .name {
            margin: 2px 0 8px;
            height: 14px;
            line-height: 14px;
            font-size: 14px;
            color: rgb(7, 17, 27);
          }
          .desc {
            margin-bottom: 8px;
            line-height: 14px;
            font-size: 10px;
            color: rgb(147, 153, 159);
          }
          .extra {
            line-height: 10px;
            font-size: 10px;
            color: rgb(147, 153, 159);
            .count {
              margin-right: 10px;
            }
          }
          .price {
            font-weight: 700;
            line-height: 24px;
            .now {
              margin-right: 8px;
              font-size: 14px;
              color: rgb(240, 20, 20);
            }
            .old {
              text-decoration: line-through;
              font-size: 10px;
              color: rgb(147, 153, 159);
            }
          }
          .contrl-wrapper {
            position: absolute;
            right: 0;
            bottom: 12px;
          }
        }
      }
    }
  }
</style>
